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2nm以下的IrRuNiMoCo高合金与富含的中氧化物外,以促进酸性氧的进化

Longping Yao^1,2, Fengru Zhang¹, Shuai Yang³

¹Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai, 201210, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|March 22, 2024

概括

这项研究引入了新型亚-2纳米高合金纳米粒子,用于在质子交换膜水电解 (PEMWE) 中有效的氧化演化反应 (OER). 催化剂显著降低了的使用和的生产成本.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

在低 (Ir) 使用的质子交换膜水电解 (PEMWE) 中,为氧化演化反应 (OER) 开发高效的电催化剂至关重要但具有挑战性.
高合金 (HEAs) 具有增强催化性能的潜力,但它们在苛刻的电化学环境中的稳定性和活性需要进一步研究.

研究的目的:

为了在PEMWE中改进OER性能,合成具有富含Ir氧化物外的低-2nm高合金纳米粒子.
研究开发的电催化剂的结构稳定性,催化机制和整体效率.
评估通过降低负荷来降低生产成本的潜力.

主要方法:

使用快速降液和表面电替换策略合成2nm以下的HEA纳米粒子.
使用先进的光谱仪进行表征,以分析外组成和结构演变.
现场微分电化学质谱,激活能分析,以及理论计算以阐明催化机制.

主要成果:

成功合成了HEA纳米粒子 (HEA@Ir-MEO) 具有富含Ir的中氧化物外和HEA核心.
富含的外有效地抑制了OER期间过渡金属的结构演变,确保了稳定性.
催化剂表现出极好的OER性能 (1.85 V/3.0 A cm−2 @80 °C),长期稳定性 (>500 h @1.0 Acm−2),以及低能耗 (3.98 kWh Nm−3 H2 @1.0 Acm−2).
实现了显著降低的使用 (≈0.4 mg cm−2) 和的生产成本 ($0.88/kg H2).

结论:

开发的HEA@Ir-MEO催化剂提供了一个有前途的途径,通过PEMWE.
富含的氧化物外在增强催化剂的耐用性和活性方面发挥着至关重要的作用.
这种方法显著降低了广泛采用绿色技术的经济障碍.

关键词:

在PEM中,水电解是水的电解.核心外结构核心外结构高合金是一种高合金.氧气进化反应反应氧气进化反应超微小的纳米粒子.

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